U.S. billionaires pledge fortunes to charity

NEW YORK (Reuters) - Dozens of U.S. billionaires pledged on Wednesday to give at least half their fortunes to charity as part of a philanthropic campaign by two of the world's richest men -- Warren Buffett and Bill Gates.

Based on Forbes magazine's estimates of the billionaires' wealth, at least $150 billion could be given away.

A total of 40 of the richest people in the United States, including Microsoft founder Gates and investor Buffett, now have taken the pledge.

Since launching the campaign in June, Buffett, Gates and his wife Melinda have spoken to about 20 percent of the wealthiest people in the United States -- 70 to 80 billionaires -- in a bid to persuade them to give away their fortunes.

"In most cases we had reason to believe that the people already had an interest in philanthropy," Buffett said. "It was a very soft sell but 40 have signed up."

"We're looking forward to enlisting many of these 40 to go out and make some calls also so we can report an even greater milestone but we're off to a terrific start," he said.

The campaign asks U.S. billionaires to give away at least half their wealth during their lifetime or after their death, and to publicly state their intention with a letter explaining their decision.
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